<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>

    <body>
        <form action="http://127.0.0.1:5000/data_form", method="POST">
            <input type="text" name="username">
            <input type="text" name="password">
            <input type="submit" value="submit">
        </form>
    </body>

</html>